#include<stdio.h>
#include<string.h>
#include<unistd.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/wait.h>
void writer(int wfd)
{
    const char* str = "hello father,I an child";
    char buffer[128];
    int cnt = 0;
    pid_t pid = getpid();
    while(1)
    {
        snprintf(buffer,sizeof(buffer),"message:%s,pid:%d,count:%d\n",str,pid,cnt);
        write(wfd,buffer,strlen(buffer));
        cnt++;
        sleep(1);
    }
}
void reader(int rfd)
{
    char buffer[1024];
    while(1)
    {
        ssize_t n = read(rfd,buffer,sizeof(buffer)-1);
        (void)n;
        printf("father get a message:%s",buffer);
    }
}
int main()
{
    //打开文件
    int pipefd[2];
    int n = pipe(pipefd);
    if(n<0) return 1;
    printf("pipefd[0]:%d,pipefd[1]:%d\n",pipefd[0]/*read*/,pipefd[1]/*write*/);

    //2 创建进程
    pid_t id = fork();
    if(id == 0)
    {
        //child; w
        close(pipefd[0]);
        writer(pipefd[1]);
        exit(0);

    }
    //father
    close(pipefd[1]);
    reader(pipefd[0]);
    return 0;
}
